Telephone-transmitter.



W. W. DEAN.

' TELEPHONE TRANSMITTER.

APPLICATION rum) APR. 2-1. 1901;.

Patented Au 15, 1911.

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Invaar 135* WIHJEIB Ban .A urns a amen-a Um'rnn sTATEs Parana. O FICE;

WILLIAM W; DEAN, seame 0310, ,ssslenon TO, THE DEAN ELECTRIC COMPANY,

- or mama, OHIO, A CORPORATION or 011m.

wefle'm; i Be it known that'lfwini, \"M V. DEAN, a citizen of the UnitedStates, residing at. Elvria, in, the' countyr ot'Lorain and State ofOhio l ave invented a'rei't'ain. new 'and Improved ,Tel'eplioneillransinitter, of which ,thel following is"ra jfi ll, clear, concise, and

exact description, r'et'erei'ice being bad to the accompanying drawings,torming a part efthis specifiestron. V

, My inveiitionj relates to transmitters for use in telephone work, andit belongs 'to that type of instruments in which granular or comminuatedmaterial, as'carbon, is used for the purpose of varying the resistanceof the circuit including the transmitter and thus .turnishing fa m'eansfor, transmitting theroicewaues. I

nMy invent"nbohsists essentially in providing a transmitthfjwith adiap'hragmhav: ing a reinforced ditterdge or periphery, and I make useof t-lii" reinforcing portion or flange to support the diaphragmat its.

,outer edge and thus constitute an edge bearing all around thecircumference of the diaphragm :The diaphragm is adapted to engage andvibrate a resistance cup or chamber which be of ordinary constructioncontaining two or more electrodes of suitconstruction,

" tat-k" tlttfltransmitter,

able material and having granular material of cmuparatively highresistance between the electrodes h'trinventiou also consists in soforming the diaphragm that the expansion of the same due to the heatproduced by'the how of current throughthe resistance material containedin the cup or chamber will tend to separate the electrodes in thechamber and thus true the granular material rather than to.brin j the elcti'odes closer together and thus cou'iprcs granular material or N Briuy iurer'ititf rl erure a larger effective area;of (Iraphragln, sincethe usual cushioning ring. arolrifl the periphery of the same 13 omittedand the action ot the diap'lnagnu is clearer amt. better, since theremoval of this mishiouing ring, also re moves a teutle'ncv toi'uutlle'ithe vibrations of .tbe;IlihyihraQan. Another disadvantage ofthe eu'shig L feliminated by y ts in eliminating mental diaphragm due'tothe aging and h'ecu'shioning ring,

all strain upon;

gradual com-p 1 JJ 'rELErnonE- rmnsm'rmn.

v Specification of Letters Patent. Patented Aug 15, 1911. applicationfiled April 24, 1905. Serial-No. 428,938."

v'vhich gradual compression; followed up by the tensioning springs ofthe transmitter,

has in the past produced serious distortion of the supplementaldiaphragm, resulting in many cases in 'a very inefficient relation ofthe parts of the resistance cup or chamber. In tny construction I avoidall results of this character by seating the bearing edge around thecircumference of the main diaphragmupon a ring of hard, practicallynonrompressible insulating material, such as mica, oiled linen, fiber orsimilar material.

As a result of the construction indicated, by my invent-ion the parts ofthe transmitter retain their proper Working position practicallyindefinitely, and the transmitter is not subjeetto deterioration for thereasons usually combining to require repair of transmitters after beingused for some time. My invention also makes it possible, to form .themain diaphragms more accurately than heretofore, and as constructed inaccordance with my invention these dia phra-gms retain their propershape much better than the ordinary form of diaphragms heretofore used.

The several drawings illustrating my invention are as followsr Figure 1is a sectional view through the transmitter assembled; Fig. 2 is a backview of thetransmitter shown in Fig. 1, with the transmitter shellremoved: Fig. 3 is a view ot,,a, ,portion of the Bridge and shows thet'ensioninp springs of .the transmitter; Fig. 4 is an enlarged sectionalviewof the workin'g parts ofthe transmitter assembled; Fig. 5 is a viewof the parts shown in Fig. 4, such parts being separated to more clearlyindicatetheir nature and construction; Fig; I) is an edge view of aportion of the bridge of the transmitter and shows the partssupportedthereby. a

Similar numerals refer tosimilar parts throughout theseveral views.

Referring to the drawings, the frontplate .t has formedtherein anannular recess extending nearly to the circumference of the front plate,and in this recess is supported tirsta disk of waterproof/material 6,which more durable than rubber, etc, not being.

subject to what: is commonly known as stacking. slacking is due to aprocess of oxidation. When slacked, the rubber gasket becomes hard andbrittle, failing absolutely to erform the functions for which it isused.

,5 The main diaphragm 4 is supported against the ring 5 by itsengagement with the resistance cup 7 which on is su ported'by the stud 9from the bri ge 2 y'ineans of'a block 10 secured to but insulated fromsuch 10 bridge. The bridge 2 is supported from the front plate 1 bysuitable screws, as indicated. V

The cup 7 consists of a body portion adapted to receive the electrode 17which is secured in place by a suitable nut as indicated, and oppositethis electrode 17 a second electrode 18 is $11 ported by means of thesupplemental diaphragm 19, secured against one side of the cup .7 by thescrew ring 20. The electrode 18 is adapted to engage the stud 9, whichoperates to clamp the supplemental diaphragm 19 securely between suchstud and the electrode 18. 4 The diaphragm 1 is centrally perforated anda flange 4" is formed around this opening which extends toward the backof the transmitter, such flangebeing adapted to fit the outer surface ofthe resistance cup 7 and rest against the edge of the clamping ring 20.Tension springsll, 11, supported by -but-- insulated from the bridge 2are provided, which rest againstthe clamping ring 20 on its rear face,and at diametrically opposite points for the purpose of placing thedesired tension upon the diaphragm 4 and thus holding the diaphragmfirmly against the insulating ring 5.

When the parts are assembled, the stud 9 is free to. move in the block10until the parts have been given their final position,

in which condition the screw 16 is tightened,

thus holding the stud 9 securely in the block 10 which .is supported bybutinsulated from the bridge 2. The tension springs 11, 11 are alsosupported by but insulated from the bridge 2.

The diaphragm 4 has formed around its outer periphery a flange 4extending toward the front of the transmitter, which flange performs thefunction of reinforcing the diaphragm and also presenting an edgebearing to the insulated material 5, which permits avery free movementof the diaphragm 4 when vibrated. The outer edge of this flange4 iscarefully turned off and thus trued up after the diaphragm is formed bymeans of suitable. dies. The diaphragm 4 is dished slightly, asindicated in Figsfit and 5 the center of the same extending slj htly infront of the outer portion, as a resultof which when the diaphragm isheated by the heating of the resistance cup,

due to the flow of current therethrough, the- 5 expansion of theoentralportionof the diain electrical connection with a block 12- phragmwill deflect such portion forward or toward the front of the transmitterand thus tend to unpack the transmitter. By this conformation of.

of this heating action is absolutely prevented, and it s impossible forthe heating of the diaphragm to pack the transmitter.

The blocks 10 and 12, supported by but insulated'from the bridge 2,constitute the terminals of the transmitter and connect-ion may be' madeto these blocks by suitable screws-15 and 13.

The shell 3, indicated in Fig. 1, is provided for rotectin the parts ofthe transmitter, an this shel is supported from the front plate byscrews adaptedto engage the posts 14 extending from the front plate tothe rear.

While I have shown my inyention in the particular embodiment hereindisclosed, I

do not limit'myself to this construction, but desire to claim broadlyall equivalent means for producing the same result.

What I claim. is: I

1. In a telephone transmitter, a casing. carbon resistance varying meanssupported from said casing and adapted to form part of an electriccircuit and means to increase the resistance of said resistance varyingmeans when the flow of current there through is increased.

' 2. In a telephone transmitter, a casing, a diaphragm sup orted by thecasing and adapted to be v1 rated by sound waves, and resistance-varyingmeans operated by such e diaphragm, motion 'ofthe central portion to therearas a result diaphragm and adapted to form part of an electriccircuit, .such diaphragm being dished outwardly to increase theresistance of such means when heated.

3. In a telephone transmitter, a casing, a diaphragm supported by thecasing and adaptedto be vibrated by sound waves, and

resistance-varying means operated by such diaphragm and adapted to formpart of an electric circuit, such diaphragm being dished outwardly toincrease the resistance of such therethrough.

4. In a telephone transmitter, a casing, a

diaphragm sup orted by the casing and adapted to be vi rated by soundwaves, such vmeans when heated by the flow of, current v diaphragmflanged at its outer edge, and resistance-varying means operated by suchdiaphragm and adapted to form part'of'an electric circuit, such diahragm being dished outwardly to increase t e resistance of such means bythe flow of current therethrough.

' 5. In a telephone transmitter, a casing, a. diaphragm supported by thecasing and adapted to be vi rated by sound waves, such diaphragm havinga peri heral flange extending at practically rig tangles'to the plane ofthe diaphragm, and resistancevarying means operated by such diaphragmand adapted to form part of an electric circuit,such diaphragmbelngdished outwardly 4m increase the resistance of such means when heated.

(5.111 a telephone transnntter, a caslng, a

diaphragm supported by the casing and adapted to be vibrated by soundwaves,such

diaphragm provided with an edge bearing around its peri iihery, andresistance-varying means operated by such diaphragm and adapted to formpart of an electric circuit,

such diaphragm being dished outwardly to increase the resistance of suchmeans when heated by the flow of current therethrougln 7. In a telephonetransmitter, a frontplate, a diaphragm bearing against but insulatedfrom the front plate, abridgesupported from the front plate back of thediaphragm, a granule chamber located between springs bearingupon suchchamber serving to hold the diaphragm in position against.

the front plate.

8. In a telephone transmitter, a front plate, a diaphragm bearingagainst but insulated from the front plate, a bridge supported from thefront plate back of the diaphragm, a granule chamber located betweensuch bridge and the diaphragm, electrodes in such chamber for directingelectric current -in position against the front plate.

through the material in the chamber, such diaphragm so dished as toseparate such electrodes and thereby agitate the granules by the floviof current therethrough. and springs bearing upon such chamber servingto hold the diaphragm in position against the front plate.

9. In a telephone transmitter, a front plate, a diaphragm bearingagainst but insulated from the front plate, a bridge supported from thefront plate back of the diaphragm, a granule chamber located between.such bridge and the chamber, electrodes in such chamber for directingelectric current through the material in the chamber, the

central portion of such diaphragm dished outward whereby the resistancebetween the electrodes is increased by the flow of current between them,and springs bearing upon such chamber serving to hold the diaphragm 10.In a telephone transmitter, a front plate, a diaphragm bearing againstbut in sulated from the front plate, a bridge supported from the frontplate back of the diaphragm, a granule chamber located between suchbridge and the diaphragm, and electrodes in such chamber for directingelectrie current through the material in the chamber, the centralportionof such diaphragm dished outward, whereby the electrodes in such;chamber are separated, the granules contained therein are agitated andthe resistancesbetween the electrodes is increased by the fiowof currentbetweenthcm.

11-. In a telephone transmitter, a front plate, a diaphragm bearingagainst but in-I sulated from the front plate, such diaphragm reinforcedaround its periphery, a bridge supported from the frontplate back of thediaphragm, a granule chamber located between such bridge-and thediaphragm, electrodes in such chamber for directing electric currentthrough the material.

in thechamber, such diaphragm being dished outwardly to increase theresistance between the electrodes by the flow of current therethrough,and springs bearing upon, such chamber serving to hold the" diaphragm.in position against the front plate. I

V 12. In a telephone transmitter, a front plate, a diaphragm having aperipheral flange formed thereon tocbear against nonyielding insulationsupported. by the front plate, a: bridgesupported from the -front plateback ofthe 'dilapl'ira'g'm', a granule chamber located between suchbridge: and

, the diaphragm, electrodesin, such chamber for directing electriccurrent; through the material in the-"chamber, such diaphragm beingdished outwardly to support such electrodes and thereby agitate,thegranules, by the flow of current therethrough; r and springs bearingupon such chamber serving to hold the diaphragm in position against thefront plate.

13. In a telephone transmitter, a front plate, a diaphragm having aflange around its peripherv at practically right angles to the plane ofthe diaphragm, the outer edge of such flange constituting a rocking edgebearing against non-yielding insulation supported by the front plate, abridge supported from the front plate back of the diaphragm, a granulechamber located between such bridge and the diaphragm. electrodes insuch chamber for directing electric current through the material in thechamber, the central portion of such diaphragm dished outward wherebythe resistance be tween the electrodes is increased when can rent flowsbetween them, and springs hearing upon such chamber serving to holdthediaphragm in position against the front plate.

14. In a telephone transmitter,- a front plate,'a diaphragm bearingagainst but insulated from the front plate, a bridge supported from thefront plate back of the dia phragm, a granule chamber located betweensuch bridge and the diaphragm. electrodes in such chamber for directingelectric current through the material in the chamber,

,such diaphragm being'dished outwardly to increase the resistancebetween the electrodes by the flow of current therethrough, and

'means for holding the diaphragm 1n positoseparate such electrodes andthereby agi-,

fate the granules by the flow of current therethrough, and-means forholding the diaphragm in position against the frontplate.

16. In a telephone transmitter, a front plate, a diaphragm bearingagainst but in-- sulated from the front plate, a bridge supported fromthe front plate back of the diaphragm, a granule chamber located betweensuch bridge and the chamber, electrodes in such chamber for directingelectric current through the material in the chamber, the centralportion of such diaphragm dished outward whereby the resistance betweenthe electrodes is increasedby the flow of current between them, andmeans for holding the diaphragm in position against the front plate.

17. In a telephone transmitter, the combination of a plate, a' diaphragmresting thereagainst, a granule chamber, an electrode therein partakingof the movements of the diaphragm, granules in said chamber,

a second electrode fixed with respectto said.

diaphragm, said diaphragm dished outwardly to agitate the granules whena current passing between said granules is changed as to strength.

18. In a. telephone transmittervthe combination of a plate, adiaphragmresting 'thc'reagainst, a granule chamber, an electrode thereinpartaking of the movements of the diaphragm, granules in said chamber, a

second electrode fixed with respect to said diaphragm, said diaphragmbeing dished outwardly to agitate the granules when the strength ofcurrent flowing through the transmitter is changed. 4 In witnesswhereof, I hereunto subscribe my name this 20 day of April A. D. 1908.

WILLIAM DEAN;

Witnesses:

A. D. T. Liner, S. A. BEYLAND.

Copies of this patent may be obtained tor'flve cents each, by addressingthe Commissioner 0! Patents Washington, D. O.

